#include <iostream> 

class OGLApp
{
private:
    OGLApp(){}; //Constructor
   
    OGLApp(const OGLApp&); //Copy constructor
    OGLApp& operator = (const OGLApp &); //Assignment
    
public:
     ~OGLApp(); //Destructor
    static OGLApp* Instance(); //Creates an instance of the class
    bool onInit();
};